Company lists · Data refreshed September 2026

Top 25 Power generation companies based in the United Kingdom

Name: Power generation companies based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 16, 2026 72 companies tracked

RevenueBase identified 72 power generation companies headquartered in the United Kingdom as of September 2026 and tracks 49,195 professional contacts across them, including 16,983 with verified work emails. London is the largest hub.

This list covers power generation companies headquartered in the United Kingdom, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 16, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 16, 2026 86% judged on-target in blind review

72Companies

49,195Contacts tracked

16,983Verified emails

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The 25 largest power generation companies based in the United Kingdom

Ranked by team size

Top 25 of 72 power generation companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 16, 2026. RevenueBase Smart Search rates how each company's information relates to power generation companies: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	National Grid	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	10001+	24,403 contacts →
	Partial evidence “We power the lives of millions of people across Britain, New York and Massachusetts, moving energy from where it’s made to the communities that need it, every single day.” Source: RevenueBase Database · checked Sep 16, 2026
2	EDF UK	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	10001+	8,188 contacts →
	Indirect evidence “EDF is leading the charge towards An Electric Britain to help make energy more affordable and sustainable.” Source: RevenueBase Database · checked Sep 16, 2026
3	Centrica	Indirect evidence	Windsor, United KingdomHQ checked Sep 16, 2026	10001+	4,555 contacts →
	Indirect evidence “Centrica is an international energy services and solutions company, founded on a 200-year heritage of serving customers in homes and businesses.” Source: RevenueBase Database · checked Sep 16, 2026
4	E.On UK	Indirect evidence	Coventry, United KingdomHQ checked Sep 16, 2026	10001+	4,343 contacts →
	Indirect evidence “It's on us to make new energy work.” Source: RevenueBase Database · checked Sep 16, 2026
5	Octopus Energy	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	1,001-5,000	3,989 contacts →
	Indirect evidence “We're on a mission to make a big green dent in the universe by building a truly sustainable energy system globally.” Source: RevenueBase Database · checked Sep 16, 2026
6	PX Group	Indirect evidence	Stockton On Tees, United KingdomHQ checked Sep 16, 2026	501-1,000	617 contacts →
	Indirect evidence “px Group is a fully integrated infrastructure solutions business which delivers net zero and stakeholder success through elite performance in the safety, availability, reliability…” Source: RevenueBase Database · checked Sep 16, 2026
7	Intergen	Strong evidence	Edinburgh, United KingdomHQ checked Sep 16, 2026	51-200	324 contacts →
	Strong evidence “InterGen is a power generation firm with four power plants in operation and a significant development pipeline in the UK, representing a total generation capacity of 2,800…” Source: RevenueBase Database · checked Sep 16, 2026
8	VPI	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	201-500	214 contacts →
	Partial evidence “With a capacity of 3.5GW, we are one of the leading power companies in the UK and Ireland.” Source: RevenueBase Database · checked Sep 16, 2026
9	Conrad Energy	Indirect evidence	Abingdon, United KingdomHQ checked Sep 16, 2026	51-200	174 contacts →
	Indirect evidence “Conrad Energy is a leading UK energy company.” Source: RevenueBase Database · checked Sep 16, 2026
10	TTEP	Strong evidence	London, United KingdomHQ checked Sep 16, 2026	501-1,000	160 contacts →
	Strong evidence “TTEP is a flexible power generation company jointly owned by EPH and TotalEnergies.” Source: RevenueBase Database · checked Sep 16, 2026
11	Excalon LTD	Indirect evidence	Salford, United KingdomHQ checked Sep 16, 2026	201-500	108 contacts →
	Indirect evidence “Excalon is one of the Britain’s leading UK Electrical Utility Service Providers.” Source: RevenueBase Database · checked Sep 16, 2026
12	Highview	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	51-200	79 contacts →
	Indirect evidence “Highview is a leading energy infrastructure business.” Source: RevenueBase Database · checked Sep 16, 2026
13	Welsh Power Pŵer Cymru	Partial evidence	Cardiff, United KingdomHQ checked Sep 16, 2026	11-50	44 contacts →
	Partial evidence “With over 550MW of flexible generation under management and a series of grid stability projects in construction and development, we play an important role in supporting a UK…” Source: RevenueBase Database · checked Sep 16, 2026
14	Enbw Generation UK	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	11-50	37 contacts →
	Indirect evidence “EnBW Energie-Baden-Württemberg AG - the name reflects our roots and our commitment.” Source: RevenueBase Database · checked Sep 16, 2026
15	Marchwood Power LTD	Partial evidence	Marchwood, United KingdomHQ checked Sep 16, 2026	11-50	28 contacts →
	Partial evidence “Marchwood Power Limited owns and operates a £380million natural gas-fired combined cycle (CCGT) power station on Marchwood Industrial Park.” Source: RevenueBase Database · checked Sep 16, 2026
16	Saltend Cogeneration Company Limited	Partial evidence	Hull, United KingdomHQ checked Sep 16, 2026	51-200	13 contacts →
	Partial evidence “Saltend Cogeneration Company Limited is a gas fired power station in Hull, UK and part of the Triton Power Ltd group of companies.” Source: RevenueBase Database · checked Sep 16, 2026
17	PM Power	Strong evidence	Lisburn, United KingdomHQ checked Sep 16, 2026	11-50	9 contacts →
	Strong evidence “Serving the UK and Ireland with Industry leading power generation solutions, specialising in: DIESEL GENERATORS GAS GENERATORS CHP CONTROLS & MONITORING EMERGING TECHNOLOGIES” Source: RevenueBase Database · checked Sep 16, 2026
18	Green Frog Power LTD	Partial evidence	Birmingham, United KingdomHQ checked Sep 16, 2026	11-50	9 contacts →
	Partial evidence “Green Frog Power Ltd is a utility company based at 17 The Courtyard, Gorsey Lane, Coleshill, Birmingham, B46 1JA.” Source: RevenueBase Database · checked Sep 16, 2026
19	ENDCO	Indirect evidence	Chelmsford, United KingdomHQ checked Sep 16, 2026	11-50	8 contacts →
	Indirect evidence “EnDCo is the brand name of EPG Energy Limited, a UK-based energy supply business operating in the corporate sector.” Source: RevenueBase Database · checked Sep 16, 2026
20	Marble Power Limited	Partial evidence	Newport, United KingdomHQ checked Sep 16, 2026	11-50	8 contacts →
	Partial evidence “MARBLE POWER LIMITED is an energy supply company based out of Kestrel Court, Waterwells Drive, Quedgeley, Gloucester, United Kingdom.” Source: RevenueBase Database · checked Sep 16, 2026
21	Independent Power Corporation PLC	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	11-50	6 contacts →
	Partial evidence “Independent Power Corporation Plc (IPC) is a UK-based Independent Power Producer dedicated to developing, owning and operating reliable, efficient and future-ready energy assets.” Source: RevenueBase Database · checked Sep 16, 2026
22	GAS Engine Exchange LTD	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	1-10	6 contacts →
	Indirect evidence “GAS ENGINE EXCHANGE LTD is a business supplies and equipment company based out of United Kingdom.” Source: RevenueBase Database · checked Sep 16, 2026
23	Concise Energy Brokers Limited	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	1-10	3 contacts →
	Indirect evidence “CONCISE ENERGY BROKERS LIMITED is an utilities company based out of 124 City Road, EC1V 2NX London, United Kingdom.” Source: RevenueBase Database · checked Sep 16, 2026
24	NET Zero Technologies	Indirect evidence	Newcastle, United KingdomHQ checked Sep 16, 2026	11-50	2 contacts →
	Indirect evidence “We empower businesses to reach Net Zero and are removing the stigma that reaching Net Zero will be a financial burden.” Source: RevenueBase Database · checked Sep 16, 2026
25	Positive Solutions Electrical LTD	Indirect evidence	Harlow, United KingdomHQ checked Sep 16, 2026	1-10	2 contacts →
	Indirect evidence “POSITIVE SOLUTIONS ELECTRICAL LTD is an utilities company based out of 4 TOLLSWORTH WAY PUCKERIDGE, NR WARE, United Kingdom.” Source: RevenueBase Database · checked Sep 16, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: power generation companies. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names power generation companies.
Partial evidence: Its own public description names part of power generation companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name power generation companies. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 72 power generation companies based in the United Kingdom

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Power generation companies based in the United Kingdom at a glance

As of Sep 16, 2026

34.5%Verified-email coverage

683.3Average contacts per company

11-50Median size (employees)

25.0%Largest-city concentration · London

Sep 16, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured worldwide rather than for United Kingdom, so it is reported there. Company counts and contact totals on this page are exact for United Kingdom, over 72 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among power generation companies, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in the United Kingdom whose own description of what they do matches “power generation companies”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names power generation companies), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among power generation companies, and records with no verified work email. Companies headquartered outside United Kingdom are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 16,983 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 16, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names power generation companies, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many power generation companies are there based in the United Kingdom?

RevenueBase identified 72 power generation companies headquartered in the United Kingdom as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

National Grid, headquartered in London, tops this list with the largest team on record.

Which city has the most power generation companies?

London leads with 18 headquartered companies, followed by Chelmsford (2) and Stockton On Tees (2).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 16,983 verified decision-maker contacts tracked across these 72 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 16, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.